Bottom up visual attention : Saliency

Bottom up model explains mechanism of our primary visual cortex which selects the saliency parts of the scene and guides our gaze.

In first example we can see horizontal line pop out immediately from vertical lines. However increasing of distractor heterogeneity can results in more difficult to search in next examples.

This example (more complex distractors) shows that distributing the distractors over several different cell types rather than a single type of neuron means the distractors are considered less probable and hence more informative thus decreasing the ratio of target to distractor saliency. There is also a secondary effect in the example given of target--distractor similarity since broad tuning means that cells tuned to a particular orientation may respond weakly to a distractor type other than that for which they are tuned, or the target. (Verghese, 2001)

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Science & Technology